Railway signaling



June 1928.

C. J. KELLOWAY RAILWAY SIGNALING INVENTOR Filed Sept. 24, 1926 Patented, June 5, 19218.

- UNIT- n CHARLES J. KnL'Low -Y, WILMINGTON, Non'rnFcARoLmA, Ass'ienon r0 UNICiNsW'ITCH & SIGl T.LaL'COMPANY,QF SWISSVALE, PENNSYLVANIA A COBP ORA 'TION cur-PEN SYLVANIA. v

RAILWAY SIGNALING.

. lpplication filed September 24,1926; Serial 1%.: 131,480. I

- My invention relates to. railway signaling, and particularly to signaling of. the automatic block type involving track circuits.

:Inthe usual systems-ofthis" charact er,;.if

a signal should stickin the proceed position or for any'other reason should, fail to assume its stop position when the associated block is occupied','the signal next in the rear will fail to indicate-caution as'it should- -One .feature: of my invention is the provision of means operating, it a-sig-nal failstoassume its stop position when a train-enters the associated -block,to cause the signal next in the rear to assume its stopfpositionl "The accompanying drawing is a diagram- :1 mat-i0 viewshowing one form .ofapparatus embodying my invent-ion. I

Referring to the drawingthe reference characters 1. and 1 designatethe track rails of a railway along which trafiic normally moves :in the direction indicated by. the

arrow. These rails are divided by insulated joints 2 to form-successive blocks or sections,

- 01" which only one complete section J-K is shown in 'the drawing. Each section is provided with the usual track circuit, comprising a battery B connected across the rails at the exit end of the sectionthrough a limiting resistance 5 and a pole-changer PC, as well as a track relay J connected across the rails at the entrance end of the section and responsive to reversals of the position of the pole-changer PC. Located at the entrance end of each section is a signal designated by the reference character S'with an exponent corresponding to the location, each of which signals is controlled by the associated track relay T in such manner that the signal indicates proceed when the relayis energized in the normal direction, caution when the relay is energized in the reverse direction, and stop when the relay is de-energized. The control of each signal. is efiected in the usual manner by a neutral contact 3 and a polar contact 4 in the associated relay. Each polechanger PC is operated by the associated signal S in such manner that this. polechanger is in the normal posit-ion when the signal indicates proceed or caution, and in the reverse position when the signal indicates stop.

The parts of the apparatus thus far described are the usual parts in a polarized for the circuit controller C to open.

track circuitautomatic signaling; system, and consequentlyno detailed explanation of the operationoi these parts is required.

Each signal S operates a circ "t controller i C in such manner that the circuit. controller is closed when,- the-signal is in the proowd position but not when the signal'is. inat-he stop position. 1 Preferably, this circuit con-i troller'. is closed from the'i88. position'oithe signal-t0. its 90 or proceed positiomalthough thisparticular'range is not'essential tolmy invention. a

Each track section is provided with a shunting path of low resistance which-passes from, rail 1*, through wire 8, circuitcontroller C,.w ire 9,resi'stance 11, wire;12, back contact 7 of the track relay for the. next,

section in advance, and wire 10. to track rail 1-. only when the trackgrelayis open andthe It will be seen that this shunt is closed v signal is inor near its nroc'eedoosition; .Be-

sistance 11 preferably has a value of substantially 02 ohm. I 1 x l .I will now assumethat a train enters the section to the right of; point Kandthatssig nal S is mechanically stuck in its proceed position, or that for some other reason: this signal fails to move to the sto position as it should. Track relay T Wlll open, and since circuit controller C is now closed, the

track circuit for section'JK is shunted by the path of low resistance through C and '7,

thereby deenergizing track relay T and placing signal S at stop. This shunting of the track circuit is analogous to that produced by thepresence of a train and does not injuriously afi'ect battery B, because of the.

limiting resistance 5 .and resistance '11. It

will be noted that this auxiliary shunting of a track circuit occurs each time-a train enters the block next in advance, but if the signals are working in proper manner, the auxiliary shunt exists only during the time required Thiscircuit controller may be arranged to open immediately after the signal moves away from its full proceed position, on the as sumption that the signal having once started,

may be assumedto moveall theway to its stop position.

Although I have herein shown and "dcscribed only one form of railway signaling apparatus embodying my invention, it is v I claim is:

understood that various changes and modifications maybe made the-rein Within the scope of the appended claims Without departing from the spirit and scope of my invention.

Having thus described my invention, What 2. In combination, a railway track divided into sections, a track circuit for each section including a track relay, a signal for each section controlled by the relay for such section, a circuit controller for each signal arranged to be closed When the signal is in the proceed position and open when the signal isin' the stop position, and a path of 10W resistance for shunting the track circuit for each section including in series aback contact of the track relay for the section next in advance and the circuit controllerfor the signal of such section next in advance.

3. In a signal system for railroads having tracks divided into sections each provided With a polarized track relay, a semaphore signal for each section, a pole-changer operated by each signal and controlling the polarity of the track circuit for the section next in the rear, and means for shunting the track circuit of each section if the next section in advance is occupied and the signal thereof is in the proceed position,

4. In a' signal system for railroads, having tracks divided into sections each provided with a polarized track relay, a semaphore signal for each section, a pole-changer operated by each signal and controlling the polarity of the track circuit for these'ction next in the rear, a circuit breaker operated by each signal and closed in its proceed position, and a partial circuit for shunting the track circuit of each section including in series a back contact of the track relay of the section next in advance and the circuit breaker of the signal for that section.

5. A signal system for railroads-having tracks dividedinto sections comprising a sempho-re signal for each section, a polarized track relay for each section governing indications of the signal for that section, a track battery and limiting resistance for supplying current to each track relay a polechanger operated by each signal forreversing the polarity of the connections between the track battery and the track relay of the section next in the rear, a circuit breaker operated by each signal and closed in its proceed position, and a partial circuit "of low resistance connected across thetrack rails of each section for shuntingits track relay and including inseries the back contact of the track relay of the next section in advance and the circuit breaker of the signal for said next section inadvance.

In testimony whereof I atilx' my signature.

CHARLES J. KELLOWAY. 

